SPICE leakage current question

R

Robert Baer

Guest
Why leakage current limits to 1e-9
Plot log scale 1e-12 to 1e-3

What the heck is making such a large leakage current and how to fix it?

Version 4
SHEET 1 2748 1028
WIRE 176 64 80 64
WIRE 336 64 176 64
WIRE 864 64 416 64
WIRE -96 128 -192 128
WIRE 80 128 -96 128
WIRE -96 192 -128 192
WIRE 176 192 176 128
WIRE 176 192 -96 192
WIRE -128 208 -128 192
WIRE -128 208 -192 208
WIRE 80 224 80 128
WIRE 176 224 176 192
WIRE 176 288 80 288
WIRE 864 304 864 64
WIRE 176 368 176 288
WIRE 864 496 864 432
FLAG 176 368 0
FLAG -96 128 P1
IOPIN -96 128 In
FLAG -96 192 P2
IOPIN -96 192 In
FLAG 864 496 0
SYMBOL diode 96 128 R180
WINDOW 0 -23 0 Left 2
WINDOW 3 45 27 Left 2
SYMATTR InstName D1
SYMATTR Value VB40X
SYMBOL diode 192 128 R180
WINDOW 0 -20 1 Left 2
WINDOW 3 -64 -30 Left 2
SYMATTR InstName D2
SYMATTR Value VB40X
SYMBOL diode 96 288 R180
WINDOW 0 24 64 Left 2
WINDOW 3 46 29 Left 2
SYMATTR InstName D3
SYMATTR Value VB40X
SYMBOL diode 192 288 R180
WINDOW 0 24 64 Left 2
WINDOW 3 -71 65 Left 2
SYMATTR InstName D4
SYMATTR Value VB40X
SYMBOL res 432 48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 1Meg
SYMBOL zener 880 368 R180
WINDOW 0 -61 38 Left 2
WINDOW 3 -108 7 Left 2
SYMATTR InstName DVR1
SYMATTR Value GV3S800
SYMBOL voltage -192 112 R0
WINDOW 0 38 54 Left 2
WINDOW 3 -136 -112 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 -133 -52 Left 2
SYMATTR InstName V1
SYMATTR Value ""
SYMATTR SpiceLine Rser=10K Cpar=317nF
SYMBOL diode 848 368 R0
WINDOW 0 49 31 Left 2
WINDOW 3 -80 30 Left 2
SYMATTR InstName D6
SYMATTR Value VB40X
TEXT -208 360 Left 2 !.dc V1 0 1000 1
TEXT 728 344 Left 2 ;Victoreen\nCorotron
TEXT -216 432 Left 2 !.MODEL GV3S800 D(Is=1e-24 Rs=10K Bv=800 Ibv=1e-24)
TEXT -96 -72 Left 2 !.MODEL VB40X D(Rs=1.4 Vj=6.5V Bv=5000 Ibv=100uA)
TEXT 104 48 Left 2 ;n001
TEXT 592 32 Left 2 ;n002
TEXT -96 -40 Left 2 ;VB40X 9mmX2mm Mfg not found; use VMI X50SG as ref
TEXT -352 232 Left 2 ;HIVOLT POWER SUPPLY\nModel PSL2-5M\n2KV @
5MA\nCONDENSER PRODUCTS CO
TEXT 696 288 Left 2 ;note: combo DVR1,D6 fair emulation
TEXT 736 440 Left 2 ;I(DVR1,D6)
TEXT 448 488 Left 2 ;Why leakage current limits to 1e-9\nPlot log scale
1e-12 to 1e-3

Thanks,

Note: In the old daze, my DOS SPICE program could .PRINT and/or .PLOT
this directly with no scale fiddling.
 
On Sun, 23 Jun 2019 13:00:41 -0800, Robert Baer wrote:

One or more of those diodes, I would guess. ;)



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Cursitor Doom wrote:
On Sun, 23 Jun 2019 13:00:41 -0800, Robert Baer wrote:

One or more of those diodes, I would guess. ;)



Leakage spec for DVR1 changed to 20e-18 made no difference.
Click to expand...
 
On 6/23/2019 4:00 PM, Robert Baer wrote:
   Why leakage current limits to 1e-9
   Plot log scale 1e-12 to 1e-3

  What the heck is making such a large leakage current and how to fix it?
Click to expand...

(omit circuit)

  Thanks,

  Note: In the old daze, my DOS SPICE program could .PRINT and/or .PLOT
this directly with no scale fiddling.
Click to expand...

Have you looked at it with log-log axes? i.e change the x axis to log
scale and look again to see if it looks reasonable to you.
 
John S wrote:
On 6/23/2019 4:00 PM, Robert Baer wrote:

    Why leakage current limits to 1e-9
    Plot log scale 1e-12 to 1e-3

   What the heck is making such a large leakage current and how to fix
it?


(omit circuit)


   Thanks,

   Note: In the old daze, my DOS SPICE program could .PRINT and/or
.PLOT this directly with no scale fiddling.

Have you looked at it with log-log axes? i.e change the x axis to log
scale and look again to see if it looks reasonable to you.
Click to expand...
Look above re my question:
Why leakage current limits to 1e-9. Plot log scale 1e-12 to 1e-3
Does that look like i DID log scale?
YUP that is what promoted the question.
 
On 6/24/2019 1:50 PM, Robert Baer wrote:
John S wrote:
On 6/23/2019 4:00 PM, Robert Baer wrote:

    Why leakage current limits to 1e-9
    Plot log scale 1e-12 to 1e-3

   What the heck is making such a large leakage current and how to
fix it?


(omit circuit)


   Thanks,

   Note: In the old daze, my DOS SPICE program could .PRINT and/or
.PLOT this directly with no scale fiddling.

Have you looked at it with log-log axes? i.e change the x axis to log
scale and look again to see if it looks reasonable to you.
  Look above re my question:
Why leakage current limits to 1e-9.   Plot log scale 1e-12 to 1e-3
  Does that look like i DID log scale?
  YUP that is what promoted the question.
Click to expand...

I did what YOU said. Than I changed the X-axis (the horizontal one) to
log scale and I do not see anything that limits to 1e-9.
 
Have you looked at it with log-log axes? i.e change the x axis to log
scale and look again to see if it looks reasonable to you.
  Look above re my question:
Why leakage current limits to 1e-9.   Plot log scale 1e-12 to 1e-3
  Does that look like i DID log scale?
  YUP that is what promoted the question.
Click to expand...

which is your question

1) why is there leakage current?

or

2) why is the leakage current limited to 1e-9?

or

3) something else?

m
 
Am 23.06.2019 um 23:00 schrieb Robert Baer:>
> Why leakage current limits to 1e-9

Hello Robert,

The leakage current is caused by the deafult value gmnin=1e-12.

1000V*1e-12mho = 1nA


You have to reduce gmin, if you don't like this limit. If you reduce
gmin too much, you will run into convergence problems.

..options gmin=1e-14

Helmut
 
Helmut Sennewald wrote:
Am 23.06.2019 um 23:00 schrieb Robert Baer:
     Why leakage current limits to 1e-9

Hello Robert,

The leakage current is caused by the deafult value gmnin=1e-12.

1000V*1e-12mho = 1nA


You have to reduce gmin, if you don't like this limit. If you reduce
gmin too much, you will run into convergence problems.

.options gmin=1e-14

Helmut
Thanks.
Click to expand...
 
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